Home / 261,638.10-391,679.55-172,991.70

Finding the Fourth Proportional to 261,638.10, 391,679.55 and 172,991.70

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Solution

The fourth proportional to 261,638.10, 391,679.55 and 172,991.70 is: 258,973.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,638.10 : 391,679.55 = 172,991.70 : x
  2. Step 2: Convert to fraction form
    261,638.10/391,679.55 = 172,991.70/x
  3. Step 3: Cross multiply
    261,638.10x = 391,679.55 × 172,991.70
  4. Step 4: Simplify right side
    261,638.10x = 67,757,311,209.74
  5. Step 5: Solve for x
    x = 67,757,311,209.74/261,638.10
  6. Step 6: Final answer
    x = 258,973.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.